阅读说明：本技术 一种基于金刚石nv色心的超导检测装置 (Superconducting detection device based on diamond NV color center ) 是由 韩永昊 杨磊 赵琳 刘浩 蒋大伟 高春晓 于 2019-09-20 设计创作，主要内容包括：本发明的一种基于金刚石NV色心的超导检测装置属于超导检测技术领域。其结构有：第一金刚石NV色心(1)、第二金刚石NV色心(2)、聚焦镜头(3)、第一反射镜(4)、滤波镜片(5)、准直透镜(6)、光谱仪(7)、光电探测器(8)、信号采集器(9)、微波发生器(10)、功率放大器(11)、铜线(12)、石英玻璃(13)、磁场产生装置(14)、第二反射镜(15)、扩束透镜(16)、激光器(17)。本发明简化了传统探测迈斯纳效应所需的线圈装置,结构简单,灵敏度更高,可操作性更强。(The invention discloses a superconducting detection device based on a diamond NV color center, and belongs to the technical field of superconducting detection. The structure is as follows: the device comprises a first diamond NV color center (1), a second diamond NV color center (2), a focusing lens (3), a first reflecting mirror (4), a filtering lens (5), a collimating lens (6), a spectrometer (7), a photoelectric detector (8), a signal collector (9), a microwave generator (10), a power amplifier (11), a copper wire (12), quartz glass (13), a magnetic field generating device (14), a second reflecting mirror (15), a beam expanding lens (16) and a laser (17). The invention simplifies the coil device required by the traditional detection of the Meissner effect, and has simple structure, higher sensitivity and stronger operability.)

1. A superconductive detection device based on diamond NV color center has the structure that: the device comprises a focusing lens (3), a first reflector (4), a filter lens (5), a collimating lens (6), a spectrometer (7), a photoelectric detector (8), a signal collector (9), a microwave generator (10), a power amplifier (11), a copper wire (12), quartz glass (13), a magnetic field generating device (14), a second reflector (15), a beam expanding lens (16) and a laser (17); the diamond color center is characterized in that the structure also comprises a first diamond NV color center (1) and a second diamond NV color center (2);

wherein the beam expanding lens (16), the second reflecting mirror (15), the first reflecting mirror (4) and the focusing lens (3) are sequentially arranged along the optical path of light emitted by the laser (17), the first reflecting mirror (4) and the second reflecting mirror (15) are kept parallel, the first diamond NV color center (1) and the second diamond NV color center (2) are positioned on the focal plane of the focusing lens (3), any one diamond NV color center can be positioned on the focus of the focusing lens (3) by moving the quartz glass (13), and the focusing lens (3), the filter lens (5), the collimating lens (6), the spectrometer (7), the photoelectric detector (8) and the output end of the photoelectric detector (8) are sequentially arranged on a light path formed after the incident light of the focusing lens (3) is reflected by the diamond NV color center positioned on the focus and connected with the input end of the signal collector (9); the output end of the microwave generator (10) is connected with the input end of the power amplifier (11), one end of the copper wire (12) is connected with the output end of the power amplifier (11), the other end of the copper wire is grounded, the copper wire (14) is attached to the quartz glass (13), the gap between the first diamond NV color center (1) and the second diamond NV color center (2) is at least 10mm and is fixed on the quartz glass (13) to be in contact with the copper wire (14), and the magnetic field generating device (14) is placed in parallel with the quartz glass (13).

2. A diamond NV colour centre based superconducting detection device according to claim 1, wherein the first mirror (4) and the second mirror (15) are both at 45 degrees to the incident light.

Technical Field

The invention belongs to the technical field of superconducting detection, and particularly relates to a superconducting detection device based on a diamond NV color center.

Background

With the continuous progress of high-voltage and low-temperature technologies, people are approaching the ultimate goal of room-temperature superconductivity. The superconducting material and the superconducting technology have wide application prospects and application values in various aspects such as national defense, scientific research, industry, human life and the like, and the realization of room-temperature superconducting can greatly promote the innovation of a series of new technologies represented by ultra-high-speed computers and data transmission. Therefore, higher requirements are also put forward for scientific research sensibility and technical means of superconducting detection of scientific research practitioners. Superconducting and superconducting materials remain a hot point of research in condensed state physics for a very long time.

The diamond NV color center is used as an element with high sensitivity, and has extremely high application value in the fields of micro-displacement measurement, biological living body imaging, quantum computation, weak magnetic field detection, superconducting detection extending to the field, and the like. At present, the preparation technology of diamond NV color center is mature, but the experimental means for realizing superconducting detection based on the substance is only mentioned.

In the known energy level of the NV colour centre of diamond, its ground state³A₂Is rotated by electrons m_sThe triplet degenerated state consisting of 0 and ± 1 energy levels. When electrons are emitted from³E excited state is de-excited to³A₂In the ground state, a photon having an energy E of 1.945eV is radiated, and fluorescence having a wavelength λ of 637nm is emitted.

Introducing a microwave field with the frequency range of 2.5-3 GHz into the NV color center of the diamond under the laser irradiation with the wavelength of 532nm, wherein the frequency m is about 2.87GHz_sMagnetic dipole oscillations are formed between the 0 and + -1 th order energy levels, and during the process of the electrons being de-excited from the excited state to the ground state, some energy is released in the form of non-radiative transitions, resulting in a lower fluorescence intensity at this time compared to when no microwave field is introduced. Thus forming a shape corresponding to m_sThe photo-detection magnetic resonance of the diamond NV colour centre, i.e. + -. 1 electron spin resonance absorption peak.

Disclosure of Invention

In view of this, the invention provides a device for realizing superconducting detection based on a diamond NV color center, which realizes the purpose of superconducting detection by acquiring and recording fluorescence and ODMR spectrum signals of the device.

The technical scheme of the invention is as follows:

a superconductive detection device based on diamond NV color center has the structure that: the device comprises a focusing lens 3, a first reflector 4, a filter lens 5, a collimating lens 6, a spectrometer 7, a photoelectric detector 8, a signal collector 9, a microwave generator 10, a power amplifier 11, a copper wire 12, quartz glass 13, a magnetic field generating device 14, a second reflector 15, a beam expanding lens 16 and a laser 17; the diamond color center cutting method is characterized in that the structure also comprises a first diamond NV color center 1 and a second diamond NV color center 2;

the beam expanding lens 16, the second reflecting mirror 15, the first reflecting mirror 4 and the focusing lens 3 are sequentially arranged along the light path of light emitted by the laser 17, the first reflecting mirror 4 and the second reflecting mirror 15 are kept parallel, the first diamond NV color center 1 and the second diamond NV color center 2 are positioned on the focal plane of the focusing lens 3, any one diamond NV color center can be positioned on the focal point of the focusing lens 3 by moving the quartz glass 13, and the focusing lens 3, the filter lens 5, the collimating lens 6, the spectrometer 7, the photoelectric detector 8 and the output end of the photoelectric detector 8 are sequentially arranged on the light path formed after the incident light of the focusing lens 3 is reflected by the diamond NV color center positioned on the focal point, and the input end of the signal collector 9; the output end of the microwave generator 10 is connected with the input end of the power amplifier 11, one end of the copper wire 12 is connected with the output end of the power amplifier 11, the other end of the copper wire is grounded, the copper wire 14 is attached to the quartz glass 13, the gap between the first diamond NV color center 1 and the second diamond NV color center 2 is at least 10mm and is fixed on the quartz glass 13 to be in contact with the copper wire 14, and the magnetic field generating device 14 is placed in parallel with the quartz glass 13.

One of the characteristic signs usually accompanied with the occurrence of the superconducting phenomenon is the meissner effect, which means that after the superconducting phenomenon occurs, the magnetic flux in the sample is completely discharged out of the body, the magnetic induction intensity is constant to zero, and the meissner effect is also called complete diamagnetism. Theoretically, a diamond NV color center can detect a 0.1 μ T magnetic field change. When the device is used for superconducting detection, the superconducting material is placed beside a diamond NV color center, and the change of a magnetic field near the superconducting material when the superconducting phenomenon occurs is detected by the diamond NV color center, so that the superconducting detection is realized.

Has the advantages that:

1. the coil device required by the traditional detection of the Maillard effect is simplified, and the structure is simple.

2. Compared with the prior art, the method has higher detection sensitivity and stronger operability.

Description of the drawings:

FIG. 1 is a block diagram of an apparatus for performing superconducting measurements based on diamond NV color centers.

FIG. 2 is an ODMR spectrum of diamond NV color centers at zero magnetic field.

FIG. 3 is an ODMR spectrum of a diamond NV color center under certain magnetic field conditions.

FIG. 4 is a mutation reflected in the ODMR spectrum of the NV color center of the diamond in the presence of superconductivity.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.